Viable pneumonic plague vaccine appears closer than ever

Plague-causing bacteria Yersinia pestis

The plague is best known for wiping out as much as a third of Europe’s population during the Black Death pandemic of the 14th century, but it’s not entirely a thing of the past. It’s enough of a present-day threat — either as a bioterrorism weapon or because of antibiotic resistance — that scientists are trying to develop a vaccine.

Dr. Ashok Chopra and a team of researchers at the University of Texas …

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